What are you planning to use this on? Some compressors work better on some things than others. IMHO, for, vocals, the RNC is the better choice. For instruments, the DBX 160 (x, xt, a) is very good (although the RNC also works well on instruments, but not bass). I definitely prefer the 160 to the RNC on drums. I also like the old Symetrix 501 on bass.
I have a DBX 266 and I can't recommend it for recording anything. Mine lives in my guitar rack which is the only application for which it is at all useful.